Will Smith raps 'Fresh Prince' theme at Gabrielle Union party - watch

Will Smith performed an impromptu set at actress Gabrielle Union's birthday party on Saturday (October 27).

The actor and rapper, backed up by producer and beatboxer Doug E. Fresh, took to the microphone at the Miami event for a freestyle rap, as well as snippets of his 1991 hit 'Summertime' and the theme to The Fresh Prince of Bel Air, in which Smith starred.